tailieunhanh - Teaching About Evolution and the Nature of Science - NAP (2004) Episode 4

Tham khảo tài liệu 'teaching about evolution and the nature of science - nap (2004) episode 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | http catalog 36 Teaching About__ Evolution and the Nature of Science In South American Darwin found fossil species that were clearly related to modern armadillos yet neither the fossils nor the living animals were found anywhere else in the world. In The Origin of Species he explained that the inhabitants of each quarter of the world will obviously tend to leave in that quarter closely allied though modified descendants. Before the start of the Cambrian period about 550 million years ago multicellular organisms lacked hard parts like shells and bones and rarely left fossils. However a few pre-Cambrian organisms left traces of their existence. Some ancient rocks contain stromatolites the remnants of bacteria that grew in columns like stacked pancakes right . Above a fossil just predating the Cambrian shows the outlines of a marine invertebrate that might have resembled a jellyfish. A timeline of evolution demonstrates the tremendous expanse of geologic time compared to the period since humans evolved. Each higher scale details part of the scale beneath it. While the estimated times of various evolutionary events continue to change as new fossils are discovered and dating methods are refined the overall sequence demonstrates both the scope and grandeur of evolutionary change. Formation of sun Formation of earth and moon r- Likely origin of life Copyright 2004 National Academy of Sciences. All rights reserved. Unless otherwise indicated all materials in this PDF File provided by the National Academies Press for research purposes are copyrighted by the National Academy of Sciences. Distribution posting or copying is strictly prohibited without written permission of the NAP Generated for marcio_andrei@ on Sat Oct 9 17 18 26 2004 http catalog Chapter 3 Evolution and the Nature of Science 37 mockingbirds on one island be different from that of a closely related mockingbird on an .